package com.danbai.ys.utils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author danbai
 * @date 2019-10-14 15:50
 */

public class IpUtils {
    private static final int MAXIP = 15;
    private static final String LOCALHOST = "127.0.0.1";
    private static final String UN = "unknown";
    private static final String FGF = ",";

    /**
     * 通过request访问者获取ip
     *
     * @param request 请求
     * @return String
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || UN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UN.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if (ip.equals(LOCALHOST)) {
                //根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                ip = inet.getHostAddress();
            }
        }
        // 多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (ip != null && ip.length() > MAXIP) {
            if (ip.indexOf(FGF) > 0) {
                ip = ip.substring(0, ip.indexOf(","));
            }
        }
        return ip;
    }
}
